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34kurt
2 years ago
11

You are recently promoted as the chief traffic management officer of a major city in the country. Based on recent data, you lear

ned that one of the leading causes of road accidents is over speeding.
In your desire to minimize road accidents, you went out to observe how traffic management rules are implemented on the streets. Your attention was caught by a fast - moving car that seemed to be breaking the speed limit of 100 kilometers per hour(km/hr.), and so you followed it along the highway. After a short time, the driver of the car noticed you and started to slow down. Eventually, he stopped on the side of the road.

Supposed the speed of the car had been noted during this time and is modeled by the quadratic equation y = 3x² + 17x - 20, where y represents the speed of the car in km/hr. and x represents the number of minutes after you started following the car. How long did it take for the car to be under surveillance before it could finally stop on the side of the road? Did the driver of the car really break the speed limit of 100 km/hr.? Explain. The result of your observation will be presented to the students in your section and will be graded by your teacher.
Mathematics
1 answer:
hram777 [196]2 years ago
6 0

Step-by-step explanation:

<h2>3(100)2 + 17(100) - 20</h2>

3(10000) + 1700 - 20

30000 + 1700 - 20

31680

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Answer:

y + 7.8 = 25.2

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Step-by-step explanation:

y + 7.8 = 25.2

(now we solve the equation .... we substract 7.8 from each side of the equation )

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5 0
3 years ago
I need the work shown not just the answers please
Yuliya22 [10]
1.) To find the surface area, we want to find the area of each side, then add them all up together:
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Since the 4 triangles have the same area, we can multiply the area we found by 4 and then add the area of the square:
SA=(4)(31.25) + 25SA=125+25SA=150 cm²

2.) <span>To find the volume use the formula: 

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3 0
3 years ago
Ty collects coins from all over the world.He had 25 coins and received 14 on his birthday.What was the percent increase in coins
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SOLUTION:

Amount added / Original amount × 100% = % increase

14 / 25 × 100 = 56%

FINAL ANSWER:

Therefore, the percentage increase in coins is 56%.

Hope this helps! :)
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2 years ago
Omar has a gift card for $40.00 at a gift shop. Omar wants to buy a hat for himself for $13.50. For his friends, he would like t
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Answer:

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The number of bracelets is x. It's a variable.

The 13.50 is a constant.

The total needs to be less than or equal to 40 because that's all the money he has.

6 0
2 years ago
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Step-by-step explanation:

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